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388
METALLURGY OF IRON AND STEEL.
Limit of carbon ; per cent.	Limits of manganese ; per cent.	NTLmber of heats.	Chemical composition ; per cent.			Ultimate strength ; pounds per square inch.		
			Carbon.	Phosphorus.	Manganese.	Actual records.	By formula.	Difference.
Basic steel : 0.020 to 0.074	0.00 to 0.09 0.10 to 0.19 0.20 to 0.29 0.30 to 0.39 0.40 to 0.49 0.50 to 0.59	12 65 4 16 34 4 i 6 42 I 2	0.0297 0.0326 0.0543 0.0608 0.0632 0.0663	0.0075 0.0073 0.0073 0.0097 0.0091 0.0133	coooco	45803 45645 47094 48034 47981 51133	,44537 44740 46411 . 47767 48849 50389	-1266 -905 -683 -267 +868 -744
0.075 to 0.124	o.io to o.rq 0.20 to 0.29 0.30to0.39 0.40 to 0,40 0.50 to 0.59 0.60 to 0.69		ooo ooo	ooo ooo	ooo ooo	45780 49378 49683 40667 51900 55773	49926 50748 53182 54345	\-4i43 +548 +1065 4-fSfo +1282 -1428
0.125 to 0.174	0.10 to 0.19 0.30 to 0.39 0,40 to 0.49 0.50 to 0.59 O.6o to O.OO	1 41 64 24 3 X 31 125 65 21 3	0.1370 0.1486 0.1531 0.1549 0,1657	0.0070 0.0107 0.0114 0.0130 0,0213	0.160 0.359 0.445 0.535 0.640	52295 54738 55800 57050 59943	52749 64897 56596 58300 61693	+454 +159 +796 +1250
0.175 to 0.224	O.2O to O.2O 0.30 to 0.39 0.40 to 0,49 0.50 to 0.69 0.60 to 0.69 0.70 to 0.79		oooooo	o.ooSo 0.0104 0.0098 0.0135 0.0152 0.0087	0.240 '    0.367 0.441 0.527 0.616 0.713	59276 60752 62547 62716 65507	55852 59611 60670 62698 63987 65424	+1732 +335 -82 +151 +1271 -83
0.225 to 0.274	0.20 to" 0,29 0.80 to 0.39 0.40 to 0.49 0,50 to 0.59 0.60 to 0.69 0.70 to 0.79 o.ooto o.gg	39 137 66 18 z Iff 70 29 8	0.2300 0,2458 0.2489 0.2490 0.2495 0.2740 o.ssSo	0.0070 0.0079 0.0105 0.0132 0.0141 0.0140 0.0150	0.260 0.365 0.451 0.529 0.627 0,710 0.040	61090 62185 64425 66107 67048 74070 67505	59909 62463 64644 66436 68465 72362 72395	-1181 +378 +219 +329 +1417 -2608 \-4.8oo
0.275 to 0.324	0.30 to 0.39 0.40 to 0.49 0.60 to 0.59 0.60 to 0.69		0.2986 0.2937 0.2907 0.2900	0.0085 0.0098 0.0128 0.0142	0.366 0.440 0.540 0.621	65920 67888 69725 72402	66753 68063 70202 71991	+833 +175 +477 -411
0.325 to 0.374	0.30 to 0.39 0.40 to 0.49 0.60 to 0.59 0.60 to 0.69	4 14 7 2	0.3443 0.3396 0.3354 0.3675	0.0200 0.0086 0.0114 0.0105	0.355 0.437 0.524 0.610	70954 71170 72365 79515	71286 71660 73572 78286	+332 +490 +1207 -1229
0.375 to 0.424	0.30 to 0.39 0.40 to 0.49 0.50 to 0,59 o.ooto o.oq 0.70 to 0.79	2 5 2 I	0.3830 0.3936 03860 0.4065 OJQ20	0.0080 0.0102 0,0110 O.022O 0,0080	0.355 0.448 0,500 0.045 0.750	73620 75107 79750 88545 85260	73154 76555 83832 83732	466 +1448 24.70 4T3 1528
is over 1500 pounds. In the basic steel there are'17 groups containing less than 5 heats and 9 of these agree within 1500 pounds. Eight groups show a difference greater than this amount. Taking both acid and basic steels, out of 29 "small" groups 16 are correct, and of the 13 that are beyond the limit 9 are single heats, most of them being steel of moderately high carbon.
In the acid steel there are 23 groups containing over 4 heats each, and all of them are within the limit of 1500 lb., only 5 having an